Precharge circuit for DC/DC boost converter startup
US7276888B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2005 |
| Grant date | Oct 2, 2007 |
| Priority date | — |
| Expiry date | Dec 2, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2017/0806
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated circuit including a precharge circuit for a DC/DC boost converter which includes a reference current circuit with a MOSFET transistor (MP4) that has a gate connected with the gate of the DC/DC boost converter's power MOSFET transistor (MP5) to form a current mirror. The precharge circuit works to approach the output voltage to the supply voltage prior to the converter startup. An included regulation circuit adjusts the gate potential at the power MOSFET transistor (MP5) and at the MOSFET transistor (MP4) in the reference circuit in response to a reduction of the drain-source voltage of the power MOSFET transistor (MP5) due to precharging load capacitance, in a sense to keep the precharge current through the power MOSFET transistor (MP5) constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.